Re: [Xen-devel] [PATCH 5/9] ARM: Xen: fix initial build problems:

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxx]
> Sent: Tuesday, October 09, 2012 9:36 AM
> To: Arnd Bergmann
> Cc: Jeremy Fitzhardinge; xen-devel@xxxxxxxxxxxxxxxxxxx; Stefano Stabellini; 
> Konrad Rzeszutek Wilk;
> linux-kernel@xxxxxxxxxxxxxxx; Russell King; 
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [PATCH 5/9] ARM: Xen: fix initial build problems:
> 
> On Tue, 2012-10-09 at 16:22 +0100, Arnd Bergmann wrote:
> > * The XEN_BALLOON code requires the balloon infrastructure that is not
> >   getting built on ARM.
> 
> I've got patches to enable this, but not for 3.7 so this looks good for
> now.
> 
> > * The tmem hypercall is not available on ARM

[reduced cc list to just us Xen chickens]

Any reason that the tmem hypercall is not available on ARM?
At a minimum, it should be available, but always return failure.
Then an ARM Linux kernel can be ready for the Xen implementation
when the Xen hypervisor supports it.

Ballooning also... why disable it rather than just have
the hypervisor fail all calls?

Wondering if it just has never been tried/tested, or if there
are known problems since everything should have been coded
quite portably.  (I do recall some arch-specific code in
the hypervisor, now that I think of it, but it was pretty small.)

I haven't been plugged in to Xen/ARM, so I don't know the
target market, but I do know that some
Android distros have been using the in-kernel tmem version
(called zcache) even though it is still a Linux staging driver,
so there probably will be demand for Xen tmem too.

Dan

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